Novel heterocycle compounds and uses thereof

ABSTRACT

The invention relates to chemical compounds, or pharmaceutically acceptable salts thereof of the formula (I): 
     
       
         
         
             
             
         
       
     
     which penetrate the blood brain barrier, inhibit the formation and accumulation of beta-amyloid, and are useful in the treatment of neurodegenerative diseases, particularly Alzheimer&#39;s disease. Further, the compounds of the present invention inhibit certain kinases, thereby being useful for the treatment of cancers of the central nervous system.

This application claims priority from U.S. Provisional Application No. 60/933,828, filed Jun. 7, 2007, the contents of which are hereby incorporated by reference in their entirety.

FIELD OF THE INVENTION

The present invention relates to novel heterocycles, their pharmaceutical compositions and methods of use. In addition, the present invention relates to therapeutic methods that penetrate the blood-brain barrier and inhibit the formation and accumulation of beta-amyloid. Accordingly, the compounds and compositions of the present invention are useful in the treatment of neurodegenerative diseases, particularly Alzheimer's disease. Further, the compounds of the present invention inhibit certain kinases, thereby being useful for the treatment of cancers of the central nervous system.

BACKGROUND OF THE INVENTION

Without being bound to theory, it is believed that the pathology of Alzheimer's disease (“AD”) involves amyloid-β (“Aβ”) peptides, which are metabolites of β-amyloid precursor protein (Alzheimer's disease-associated precursor protein or “APP”), and are believed to be major pathological determinants of AD. These peptides consist mainly of 40 to 42 amino acids, Aβ1-40 (“Aβ40”) and Aβ1-42 (“Aβ42”), respectively. Aβ40 and Aβ42 are generated by two enzymatic cleavages occurring close to the C-terminus of APP. The enzymes responsible for the cleavage, β-secretase and γ-secretase, generate the N- and C-termini of Aβ, respectively. The amino terminus of Aβ is formed by β-secretase cleavage between methionine residue 596 and aspartate residue 597 of APP (numbering based o APP 695 isoform). γ-secretase cleaves at varying positions 38-, 40- or 43-residues C-terminal of this β-secretase cleavage product to release the Aβ peptides. A third enzyme, α-secretase, cleaves the precursor protein between the Aβ- and γ-cleavage sites, thus precluding Aβ production and releasing an approximately 3 kDa peptide known as P3, which is non-pathological. Both β- and α-secretase cleavage also result in soluble, secreted-terminal fragments of APP, known as sAPPβ and sAPPα, respectively. The sAPPα fragment has been suggested to be neuroprotective. These secretases may also be involved in the processing of other important proteins. For example, γ-secretase also cleaves Notch-1 protein.

A drug which selectively inhibits Aβ formation and/or accumulation is thus of potential interest for the treatment, management and prevention of Alzheimer's disease. To maximize utility, however, it is also desirable that it can be readily delivered to relevant site of action in the brain. Brain is protected from chemical insult by a selective barrier, referred to as the blood-brain barrier (“BBB”), that many drug-like compounds are unable to penetrate.

International Patent Publication No. WO 03/057165 discloses that certain previously known inhibitors of tyrosine kinases are useful to inhibit the production of and accumulation of Aβ. Such compounds included those described in U.S. Pat. No. 5,521,184, which includes imatinib. Netzer et al., Proc Nall Acad Sci., 100(21):12444-9(2003) showed that imatinib inhibits production of AP without affecting γ-secretase cleavage of Notch-1 and without unacceptable toxicity to the neurons. A major disadvantage with using imatinib for the treatment or prevention of Alzheimer's disease, however, is that penetration of this compound across the BBB is poor because imatinib is actively pumped out of the brain by a P-glycoprotein system, thereby preventing high concentrations of the compound from accumulating in the brain. Accordingly, imatinib is generally not used for the treatment of cancers of the central nervous system.

International Patent Publication No. WO 05/072826 describes compositions and methods of use for tyrosine kinase inhibitors to treat pathogenic infection. J. Zimmermann et al., Bioorganic & Medicinal Chem. Lett., 7(2):187-192 describes potent and selective inhibitors of the ABL-kinase: phenylamino-pyrimidine (PAP) derivatives. International Patent Publication No. EP 1 533 304 describes amide derivatives. International Patent Publication No. WO 04/005281 describes inhibitors of tyrosine kinases. International Patent Publication No. WO 05/039586 describes the use of pyridinyl-pyrimidinylamino-benzamide derivatives for the treatment of amyloid related disorders. U.S. Pat. No. 5,521,184 describes pyrimidine derivatives and processes for the preparation thereof. International Patent Publication WO 04/110452 describes substituted phenyl compounds.

SUMMARY OF THE INVENTION

The present invention is directed to compounds of formula (I):

which penetrate the blood-brain barrier, inhibit the formation and accumulation of beta-amyloid, and are useful in the treatment of neurodegenerative diseases, particularly Alzheimer's disease. Further, the compounds of the present invention inhibit certain kinases, thereby being useful for the treatment of cancers of the central nervous system.

DETAILED DESCRIPTION OF THE INVENTION

The compounds of the present invention are represented by formula (I):

in free or salt form, wherein:

A¹ is CH or N;

R¹ is C₁₋₆alkyl, C₁₋₆cycloalkyl, or aryl optionally substituted with alkyl, haloalkyl, alkyloxy, or halo group;

R², R³, R⁴, R⁵, R⁶ and R⁷ are independently hydrogen, halo, C₁₋₄alkyl, C₁₋₄alkyloxy, or trifluoromethyl;

or R⁵ and R⁶, together with carbon atoms to which they are attached, form a 5 or 6 member hetcyclic ring;

Y is —NHCO—, —CONH—, —NHSO₂—, —NHCONH—, or —NHCH₂—;

D is a 5 or 6 membered aryl, hetaryl, or hetcyclic ring having at least one N, S, or O ring atom, or a C ring atom forming an oxo (C═O) moiety; provided that D is not a substituted phenyl group if A¹=N and R²═R³═R⁴═R⁵═R⁶═H and R⁷═CH₃ and Y═NHCO; and

R⁸ is C₀₋₆alkyl, C₃₋₇cycloalkyl, aryl, hetaryl, aryl(C₁₋₄alkyl)-, hetcyclyl(C₀₋₄alkyl)-, or —C₀₋₆alkyl-N(C₀₋₆alkyl)(C₀₋₆alkyl), optionally substituted with C₁₋₆alkyl.

In one aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —NHCO— and the other variables are as defined above for Formula I.

In an embodiment of this aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —NHCO—; A¹ is N; and the other variables are as defined above for Formula I.

In a second aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —CONH— and the other variables are as defined above for Formula I.

In an embodiment of the second aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —CONH—; A¹ is N; and the other variables are as defined above for Formula I.

In another embodiment of the second aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —CONH—; A¹ is N; R⁵ and R⁶, together with carbon atoms to which they are attached, form a 5 or 6 member hetcyclic ring; and the other variables are as defined above for Formula I.

In another embodiment of the second aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —CONE—; A¹ is C; and the other variables are as defined above for Formula 1.

In a third aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —NHSO₂— and the other variables are as defined above for Formula I.

In a fourth aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —NHCONH— and the other variables are as defined above for Formula I.

In a fifth aspect, the compounds of the present invention are represented by Formula I in free or salt form, wherein Y is —NHCH₂— and the other variables are as defined above for Formula I.

In another aspect of the present invention, compounds of the invention are selected from the following compounds:

in free or salt form.

Therefore, the invention provides the following:

-   -   1.1 a Compound of Formula I, wherein A¹ is CH or N;     -   1.2 a Compound of Formula I or 1.1, wherein A¹ is CH;     -   1.3 a Compound of Formula I or 1.1, wherein A¹ is N;     -   1.4 a Compound of Formula I or 1.1, 1.2 or 1.3, wherein R¹ is         C₁₋₆alkyl, C₁₋₆cycloalkyl, or aryl optionally substituted with         alkyl, haloalkyl, alkyloxy, or halo group;     -   1.5 a Compound of Formula I or any of 1.1-1.4, wherein R¹ is         aryl optionally substituted with alkyl, haloalkyl, alkyloxy, or         halo group;     -   1.6 a Compound of Formula I or any of 1.1-1.5, wherein R¹ is         aryl;     -   1.7 a Compound of Formula I or any of 1.1-1.6, wherein R¹ is         phenyl;     -   1.8 a Compound of Formula I or any of 1.1-1.5, wherein R¹ is         phenyl optionally substituted with alkyl, haloalkyl, alkyloxy,         or halo group;     -   1.9 a Compound of Formula I or any of 1.1-1.5, wherein R¹ is         aryl optionally substituted with halo (e.g., chloro, flouro);     -   1.10 a Compound of Formula I or any of 1.1-1.5 or 1.9, wherein         R¹ is phenyl optionally substituted with halo (e.g., chloro,         flouro);     -   1.11 a Compound of Formula I or any of 1.1-1.5 or 1.9-1.10,         wherein R¹ is phenyl optionally substituted with chloro and         fluoro;     -   1.12 a Compound of Formula I or any of 1.1-1.5 or 1.9-1.11,         wherein R¹ is 3-chloro-2-fluorophenyl;     -   1.13 a Compound of Formula I or any of 1.1-1.5, wherein R¹ is         aryl optionally substituted with haloalkyl (e.g.,         trifluoromethyl);     -   1.14 a Compound of Formula I or any of 1.1-1.5 or 1.13, wherein         R¹ is phenyl optionally substituted with haloalkyl (e.g.,         trifluoromethyl);     -   1.15 a Compound of Formula I or any of 1.1-1.5 or 1.13-1.14,         wherein R¹ is phenyl optionally substituted with         trifluoromethyl;     -   1.16 a Compound of Formula I or any of 1.1-1.5 or 1.13-1.15,         wherein R¹ is 4-trifluoromethylphenyl;     -   1.17 a Compound of Formula I or any of 1.1-1.5 or 1.13-1.15,         wherein R¹ is 3-trifluoromethylphenyl;     -   1.18 a Compound of Formula I or any of 1.1-1.5, wherein R¹ is         aryl optionally substituted with alkyl (e.g., methyl);     -   1.19 a Compound of Formula I or any of 1.1-1.5 or 1.18, wherein         R¹ is phenyl optionally substituted with alkyl (e.g., methyl);     -   1.20 a Compound of Formula I or any of 1.1-1.5 or 1.18-1.19,         wherein R¹ is phenyl optionally substituted with methyl;     -   1.21 a Compound of Formula I or any of 1.1-1.5 or 1.18-1.20         wherein R¹ is 4-methylphenyl;     -   1.22 a Compound of Formula I or any of 1.1-1.5 wherein R¹ is         aryl optionally substituted with alkoxy (e.g., methoxy);     -   1.23 a Compound of Formula I or any of 1.1-1.5 or 1.22 wherein         R¹ is phenyl optionally substituted with alkoxy (e.g., methoxy);     -   1.24 a Compound of Formula I or any of 1.1-1.5 or 1.22-1.23         wherein R¹ is 4-methoxyphenyl;     -   1.25 a Compound of Formula I or any of 1.1-1.4, wherein R¹ is         C₁₋₆alkyl (e.g., ethyl);     -   1.26 a Compound of Formula I or any of 1.1-1.4 or 1.25, wherein         R¹ is ethyl;     -   1.27 a Compound of Formula I or any of 1.1-1.26, wherein R², R³,         R⁴, R⁵, R⁶ and R⁷ are independently hydrogen, halo, C₁₋₄alkyl,         C₁₋₄alkyloxy, or trifluoromethyl;     -   1.28 a Compound of Formula I or any of 1.1-1.27, wherein any of         R² is hydrogen;     -   1.29 a Compound of Formula I or any of 1.1-1.28, wherein R³ is         trifluoromethyl;     -   1.30 a Compound of Formula I or any of 1.1-1.28, wherein R³ is         hydrogen;     -   1.31 a Compound of Formula I or any of 1.1-1.30, wherein R⁴ is         hydrogen;     -   1.32 a Compound of Formula I or any of 1.1-1.31, wherein R⁵ is         hydrogen;     -   1.33 a Compound of Formula I or any of 1.1-1.32, wherein R⁶ is         hydrogen;     -   1.34 a Compound of Formula I or any of 1.1-1.31, wherein R⁵ and         R⁶, together with carbon atoms to which they are attached, form         a 5 or 6 member hetcyclic ring;     -   1.35 a Compound of Formula I or any of 1.1-1.31 or 1.34, wherein         R⁵ and R⁶, together with carbon atoms to which they are         attached, form a 5-member hetcyclic ring;     -   1.36 a Compound of Formula I or any of 1.1-1.31 or 1.34-1.35,         wherein R⁵ and R⁶, together with carbon atoms to which they are         attached, form a tetrahydrofuran;     -   1.37 a Compound of Formula I or any of 1.1-1.36, wherein R⁷ is         C₁₋₄alkyl (e.g., methyl);     -   1.38 a Compound of Formula I or any of 1.1-1.37, wherein R⁷ is         methyl;     -   1.39 a Compound of Formula I or any of 1.1-1.36, wherein R⁷ is         halo;     -   1.40 a Compound of Formula I or any of 1.1-1.36 or 1.39, wherein         R⁷ is fluoro;     -   1.41 a Compound of Formula I or any of 1.1-1.36, wherein R⁷ is         hydrogen;     -   1.42 any of the foregoing compound wherein Y is —NHCO—, —CONH—,         —NHSO₂—, —NHCONH—, or —NHCH₂—;     -   1.43 a Compound of Formula I or any of 1.1-1.42, wherein Y is         —NHCO—;     -   1.44 a Compound of Formula I or any of 1.1-1.42, wherein Y is         —CONH—;     -   1.45 any of the foregoing formulae wherein D is a 5 or 6         membered aryl, hetaryl, or hetcyclic ring having at least one N,         S, or O ring atom, or a C ring atom forming an oxo (C═O) moiety;         provided that D is not a substituted phenyl group if A¹=N and         R²═R³═R⁴═R⁵═R⁶═H and R⁷═CH₃ and Y═NHCO;     -   1.46 a Compound of Formula I or any of 1.1-1.45, wherein D is         aryl;     -   1.47 a Compound of Formula I or any of 1.1-1.46, wherein D is         phenyl;     -   1.48 any of the foregoing formulae, wherein R⁸ is C₀₋₆alkyl,         C₃₋₇cycloalkyl, aryl, hetaryl, aryl(C₁₋₄alkyl)-,         hetcyclyl(C₀₋₄alkyl)-, or —C₀₋₄alkyl-N(C₀₋₆alkyl)(C₀₋₆alkyl),         optionally substituted with C₁₋₆alkyl;     -   1.49 any of the foregoing formulae, wherein R⁸ is         hetcyclyl(C₀₋₄alkyl)-optionally substituted with C₁₋₆alkyl;     -   1.50 any of the foregoing formulae, wherein R⁸ is         piperidin-1-ylmethyl or (pyrrolidin-1-yl)ethyl;     -   1.51 a Compound of Formula I or any of 1.1-1.49, wherein R⁸ is         (piperazin-1-yl)methyl optionally substituted with C₁₋₆alkyl;     -   1.52 Compound of Formula I or any of 1.1-1.49 or 1.51, wherein         R⁸ is (piperazin-1-yl)methyl optionally substituted with methyl;     -   1.53 Compound of Formula I or any of 1.1-1.49 or 1.52, wherein         R⁸ is 4-methyl(piperazin-1-yl)methyl;     -   1.54 any of the foregoing compounds selected from the following:

-   -   1.55 Any of the foregoing compounds wherein said compound is:

-   -   1.56 Any of the foregoing compounds wherein said compound is:

in free or salt form.

The term “alkyl” includes both straight and branched chain alkyl groups. References to individual alkyl groups such as “propyl” are specific for the straight chain version only and references to individual branched chain alkyl groups such as ‘isopropyl’ are specific for the branched chain version only. For example, “C₁₋₆alkyl” includes C₁₋₄ alkyl, C₁₋₃alkyl, propyl, isopropyl and t-butyl. A similar convention applies to other radicals, for example “phenylC₁₋₆alkyl” includes phenylC₁₋₄alkyl, benzyl, 1-phenylethyl and 2-phenylethyl. “C₀alkyl” refers to a hydrogen terminus when the C₀alkyl is terminal and refers to a direct bond when the “C₀alkyl” is bridging (linking). The term “C₀₋₆alkyl”, for example, refers to adding “C₀alkyl” to the scope of the “C₁₋₆alkyl” definition. Thus, it is understood that substituents allowed for “C₁₋₆alkyl” would accordingly be allowed for the “C₁₋₆alkyl” within the scope of “C₀₋₆alkyl”.

The term “halo” refers to fluoro, chloro, bromo and iodo.

Where optional substituents are chosen from, for example, “1-5 independent” substituents from a list of substituents, it is to be understood that this definition includes all substituents being chosen from one of the specified groups or the substituents being chosen from two or more of the specified groups in the list. Where a substituent is recited using the molecule (parent) name, it is understood that the substituent is the radical of such molecular parent.

An “aryl” is well understood by one in the art and includes phenyl and naphthyl.

A “hetaryl” is a 4-12 membered fully unsaturated or partially unsaturated heterocyclic mono or bicyclic ring containing at least one nitrogen, sulphur or oxygen ring atom and in which, unless otherwise specified, a —CH₂— group can optionally be replaced by a —C(O)—. Examples of such hetaryl include indolyl, pyridyl, furyl, thienyl, pyranyl, pyrrolyl, pyrazolyl, isothiazolyl, isobenzofuranyl, 2,3-dihydrobenzofuranyl, imidazo[1,2-a]pyridinyl, benzimidazolyl quinolyl, pyrrolinyl, imidazolyl, pyrimidyl, pyrazinyl, pyridazinyl, isoxazolyl, benzoxazolyl, benzoxazol-2-one, benzopyridazin-dione, pyridine-N-oxide, and quinoline-N-oxide.

A “hetcyclyl” is a saturated, mono or bicyclic ring containing 4-12 atoms containing at least one nitrogen, sulphur or oxygen ring atom. Examples of such “hetcyclyl” include pyrrolidinyl, imidazolidinyl, pyrazolininyl, tetrahydropyranyl, morpholino, piperidyl, and piperazinyl.

Examples of “C₁₋₆alkoxy” include methoxy, ethoxy and propoxy.

Examples of “—(C₀₋₆alkyl)-N(C₀₋₆alkyl)(C₀₋₆alkyl)” include methylamino, ethylamino, di-N-methylamino, di-(N-ethyl)amino, and N-ethyl-N-methylamino.

A suitable salt of a compound of the invention is, for example, an acid-addition salt of a compound of the invention which is sufficiently basic, for example, an acid-addition salt with, for example, an inorganic or organic acid, for example hydrochloric, hydrobromic, sulphuric, phosphoric, trifluoroacetic, citric or maleic acid. In addition a suitable salt of a compound of the invention which is sufficiently acidic is an alkali metal salt, for example a sodium or potassium salt, an alkaline earth metal salt, for example a calcium or magnesium salt, an ammonium salt or a salt with an organic base which affords a physiologically-acceptable cation, for example a salt with methylamine, dimethylamine, trimethylamine, piperidine, morpholine or tris-(2-hydroxyethyl)amine.

It is also to be understood that certain compounds of the formula (I), e.g., any of 1.1-1.56, can exist in solvated as well as unsolvated forms such as, for example, hydrated forms. It is to be understood that the invention encompasses all such solvated forms which inhibit the formation and accumulation of beta-amyloid.

Particular values of variable groups are as follows. Such values may be used where appropriate with any of the definitions, claims or embodiments defined hereinbefore or hereinafter. According to a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined hereinbefore, in association with a pharmaceutically acceptable diluent or carrier.

The composition may be in a form suitable for oral administration, for example as a tablet or capsule, for parenteral injection (including intravenous, subcutaneous, intramuscular, intravascular or infusion) as a sterile solution, suspension or emulsion, for topical administration as an ointment or cream or for rectal administration as a suppository.

In general the above compositions may be prepared in a conventional manner using conventional excipients.

The compound of formula (I) e.g., any of 1.1-1.56, will normally be administered to a warm-blooded animal at a unit dose within the range 1-1000 mg/kg, and this normally provides a therapeutically-effective dose. Preferably a daily dose in the range of 10-100 mg/kg is employed. However the daily dose will necessarily be varied depending upon the host treated, the particular route of administration, and the severity of the illness being treated. Accordingly the optimum dosage may be determined by the practitioner who is treating any particular patient.

According to a further aspect of the present invention there is provided a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined hereinbefore for use in a method of treatment of the human or animal body by therapy.

We have found that the compounds defined in the present invention, or a pharmaceutically acceptable salt thereof, can penetrate the blood-brain barrier and inhibit the formation and accumulation of beta-amyloid. Accordingly the compounds of the present invention are useful in the treatment of neurodegenerative diseases, particularly Alzheimer's disease.

We have found that the compounds defined in the present invention, or a pharmaceutically acceptable salt thereof, can inhibit certain kinases. Accordingly the compounds of the present invention are useful in the treatment of cancers of the central nervous system.

Thus according to this aspect of the invention there is provided a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined hereinbefore for use as a medicament.

According to a further aspect of the invention there is provided the use of a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined hereinbefore in the manufacture of a medicament for use in the inhibition of the formation and accumulation of beta-amyloid in a warm-blooded animal such as man.

According to an aspect of the invention there is provided the use of a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined hereinbefore in the manufacture of a medicament for use in the production of an inhibition of certain kinases across the blood-brain barrier in a warm-blooded animal such as man.

According to a further feature of the invention, there is provided the use of a compound of the formula (I), e.g., any of 1.1-1.56, in free or salt form, as defined herein before in the manufacture of a medicament for use in the treatment of cancers of the nervous system and the brain.

According to a further feature of this aspect of the invention there is provided a method for producing an inhibitory effect against the accumulation of abnormal protein aggregates in a warm-blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound of formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt form.

Furthermore, the compounds of this invention, e.g., compound of formula (I) or any of 1.1-1.56, in free or pharmaceutically acceptable salt form, are useful in the treatment, control and management of diseases characterized by accumulation of abnormal protein aggregates, especially in the brain—for example, diseases such as Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloidosis, Parkinson's disease, Huntington's disease, prion disease and/or vascular, neurological, and/or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins such as Aβ. Such abnormal protein aggregates include, for example, i) amyloid plaques and neurofibrillary tangles, and ii) precipitates of tau or amyloid proteins such as Aβ.

Accordingly, the present invention provides methods of treatment of Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloeiosis, Parkinson's disease, Huntington's disease, prion disease and/or vascular, neurological, and/or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins such as AB Such method comprises administering to a patient in need thereof an effective amount of a compound of formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt form.

Additionally, the present invention provides methods of treatment of hyperproliferative diseases, especially cancers of the brain or central nervous system, including astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, and pituitary adenoma. Such method comprises administering to a patient in need thereof an effective amount of a compound of formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt form.

The present invention also provides methods of treatment of disease characterized by dysfunctional expression or activity of kinases such as the c-Abl, BCR-Abl, ARG, c-Src, c-Kit, FAK, Trk, EGFR, VEGFR, Tie-2, c-Met, FGFR-1, Flt-1, Her-2, c-Raf, PDGFR, PDGFR-beta, MAPK, PKA, PKC, PKCα, PKCδ, CDK5, GSK-3, or JNK, especially over-expression or over-activity of kinases in CNS cells, comprising the administration of an effective amount of a compound or composition of the present invention in free or salt form to a human or animal patient in need thereof. The compound or composition of the present invention useful for the methods of the present methods include a compound of formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt form.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt form, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment, control and management of diseases characterized by accumulation of abnormal protein aggregates, especially in the brain, such as Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloidosis, Parkinson's disease, Huntington's disease, prion disease and/or vascular, neurological, and/or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins such as Aβ. Such abnormal protein aggregates include, for example, i) amyloid plaques and neurofibrillary tangles, and ii) precipitates of tau or amyloid proteins such as Aβ.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amylois neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloeiosis, Parkinson's disease, Huntington's disease, prion disease and/or vascular, neurological, and/or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins such as Aβ.

The treatment methods include administering the compounds of the present invention, e.g., any of 1.1-1.56, in free or salt form, together with other therapeutic compounds to treat Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amylois neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloeiosis, Parkinson's disease, Huntington's disease, prion disease and/or vascular, neurological, and/or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins such as Aβ.

Such conjoint treatment may be achieved by way of the simultaneous, sequential or separate dosing of the individual components of the treatment. Such combination products employ the compounds of this invention within the dosage range described hereinbefore and the other pharmaceutically-active agent within its approved dosage range.

In addition to their use in therapeutic medicine, the compounds of formula (I) e.g., any of 1.1-1.56, and their pharmaceutically acceptable salts are also useful as pharmacological tools in the development and standardisation of in vitro and in vivo test systems for the evaluation of the effects of inhibitors of accumulation of abnormal protein aggregates, especially in the brain, as part of the search for new therapeutic agents.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the of treatment of hyperproliferative diseases, especially cancers of the brain or central nervous system, including astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, and pituitary adenoma.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, and pituitary adenoma.

The treatment methods include administering the compounds of the present invention, e.g., any of 1.1-1.56, in free or salt form, together with other therapeutic compounds to treat hyperproliferative diseases, especially cancers of the brain or central nervous system, including astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, and pituitary adenoma.

Such conjoint treatment may be achieved by way of the simultaneous, sequential or separate dosing of the individual components of the treatment. Such combination products employ the compounds of this invention within the dosage range described hereinbefore and the other pharmaceutically-active agent within its approved dosage range.

In addition to their use in therapeutic medicine, the compounds of formula (I) e.g., any of 1.1-1.56, in free or pharmaceutically acceptable salt forms are also useful as pharmacological tools in the development and standardisation of in vitro and in vivo test systems for the evaluation of the effects of dysfunctional expression or activity of kinases such as the c-Abl, BCR-Abl, ARG, c-Src, c-Kit, FAK, Trk, EGFR, VEGFR, Tie-2, c-Met, FGFR-1, Flt-1, Her-2, c-Raf, PDGFR, PDGFR-beta, MAPK, PKA, PKC, PKCα, PKCδ, CDK5, GSK-3, or INK, especially over-expression or over-activity of kinases in CNS cells, as part of the search for new therapeutic agents.

In the above other pharmaceutical composition, process, method, use and medicament manufacture features, the alternative and preferred embodiments of the compounds of the invention described herein also apply.

EXAMPLES

The invention will now be illustrated by the following non limiting examples in which, unless stated otherwise:

(i) temperatures are given in degrees Celsius (° C.); operations were carried out at room or ambient temperature (“rt”) were at a temperature in the range of 18-25° C.; (ii) organic solutions were dried over anhydrous sodium sulphate; evaporation of solvent is carried out using a rotary evaporator under reduced pressure (600-4000 Pascals; 4.5-30 mmHg) with a bath temperature of up to 60° C.; (iii) in general, the course of reactions is followed by TLC and reaction times are given for illustration only; (iv) final products had satisfactory proton nuclear magnetic resonance (NMR) spectra and/or mass spectral data; (v) yields are given for illustration only and are not necessarily those which can be obtained by diligent process development; preparations were repeated if more material is required; (vii) when given, NMR data is in the form of delta values for major diagnostic protons, given in parts per million (ppm) relative to tetramethylsilane (TMS) as an internal standard, determined at 400 MHz using perdeuterio dimethyl sulphoxide (DMSO-d₆) as solvent unless otherwise indicated; (vii) chemical symbols have their usual meanings; SI units and symbols are used; (viii) solvent ratios are given in volume:volume (v/v) terms; and (ix) mass spectra were run with an electron energy of 70 electron volts in the chemical ionization (CI) mode using a direct exposure probe; where indicated ionization is effected by electron impact (EI), fast atom bombardment (FAB) or electrospray (ESP); values for m/z are given; generally, only ions which indicate the parent mass are reported; and unless otherwise stated, the mass ion quoted is [MH]⁺; (x) where a synthesis is described as being analogous to that described in a previous example the amounts used are the millimolar ratio equivalents to those used in the previous example; (xi) the following abbreviations have been used:

-   -   Cs₂CO₃ cesium carbonate;     -   HOBt 1H-benzo[d][1,2,3]triazol-1-ol;     -   HPLC high performance liquid chromatography;     -   MeOH methanol;     -   NaHCO₃ sodium bicarbonate;     -   BOP benzotriazol-1-yloxytris(dimethylamino)phosphonium         hexafluorophosphate;     -   THF tetrahydrofuran;     -   DMF N,N-dimethylformamide;     -   EtOAc ethyl acetate;     -   DIEA N, N-diisopropylethylamine;     -   DCM dichloromethane;     -   DMSO dimethylsulphoxide; and     -   MeCN acetonitrile;         (xii) “ISCO” refers to normal phase flash column chromatography         using 12 g and 40 g pre-packed silica gel cartridges used         according to the manufacturer's instructions obtained from ISCO,         Inc, 4700 superior street Lincoln, Nebr., U.S.A.

Example 1 N-(3-(4-(3-Chloro-2-fluorophenyl)pyrimidin-2-ylamino)phenyl)-4-(piperidin-1-ylmethyl)benzamide

(a) N-(3-Bromophenyl)-4-(piperidin-1-ylmethyl)benzamide

DIEA (433 μL, 2.49 mmol) was added into a suspension of 3-bromobenzenamine (90.3 μL, 0.829 mmol), 4-(piperidin-1-ylmethyl)benzoic acid (200 mg, 0.912 mmol), BOP (477 mg, 1.08 mmol) in DMF (2 mL). The reaction mixture was stirred at room temperature under argon atmosphere overnight. The reaction mixture was loaded onto a 5 g silica loading cartridge. After solvent in the cartridge was dried out under vacuum, the cartridge was put on the ICSO system for purification (yield: 80%). MS (ESI⁺) m/z 373.0 [M+H]⁺.

(b) N-(3-(4-(3-Chloro-2-fluorophenyl)pyrimidin-2-ylamino)phenyl)-4-(piperidin-1-ylmethyl)benzamide

A mixture of N-(3-bromophenyl)-4-(piperidin-1-ylmethyl)benzamide (20 mg, 0.054 mmol) and 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine (18 mg, 0.080 mmol), KOBu^(t) (12 mg, 0.11 mmol), Pd₂(dba)₃ (2.5 mg, 0.027 mmol) and Xantphos (2.5 mg, 0.043 mmol) in a microwave reaction vessel was suspended in 0.6 mL of toluene. The reaction mixture was heated in a microwave at 150° C. for 1 h. After cooling, the mixture was diluted with DMF, and then filtered with a 0.45 μm microfilter. The obtained filtrate was separated by a semi-preparative HPLC. Collected product fraction was lyophilized to give pure product as a while powder. MS (ESI⁺) m/z 516.2 [M+H]⁺.

Example 2 4-(Piperidin-1-ylmethyl)-N-(3-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-(3-(trifluoromethyl)phenyl)pyrimidin-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 532.1 [M+H]⁺.

Example 3 4-(Piperidin-1-ylmethyl)-N-(3-(4-(trifluoromethyl)pyrimidin-2-ylamino)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-(trifluoromethyl)pyrimidin-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 456.2 [M+H]⁺.

Example 4 4-Methyl-N-(4-((4-methylpiperazin-1-yl)methyl)phenyl)-3-(4-phenylpyrimidin-2-ylamino)benzamide

(a) Methyl 4-methyl-3-(4-phenylpyrimidin-2-ylamino)benzoate

A mixture of 4-phenylpyrimidin-2-amine (100 mg, 0.58 mmol) and methyl 3-bromo-4-methylbenzoate (111 mg, 0.48 mmol), Cs₂CO₃ (221 mg, 0.68 mmol), Pd₂(dba)₃ (22 mg, 0.024 mmol) and Xantphos (22 mg, 0.039 mmol) in a microwave reaction vessel was suspended in 5 mL of toluene. The reaction mixture was heated in a microwave at 130° C. for 30 min, and then at 180° C. for 30 min. After cooling, the mixture was purified by ISCO system to give 80 mg of product (yield: 43%). MS (ESI⁺) m/z 320.1 [M+H]⁺.

(b) 3-Bromo-4-methylbenzoic acid

1 mL of 2.5N NaOH was added into a solution of methyl 4-methyl-3-(4-phenylpyrimidin-2-ylamino)benzoate (80 mg, 0.25 mmol) in methanol (1 mL). The reaction mixture was stirred at 40° C. for 1 h. Solvent was removed under reduced pressure. The obtained residue was treated with 5 mL of water, and then adjusted to pH=4. The resulting suspension was extracted with dichloromethane three times. Organic phase was combined and evaporated to remove solvent to give 40 mg of product as white powder (yield: 53%). MS (ESI⁺) m/z 306.2 [M+H]⁺.

(c) 4-Methyl-N-(4-((4-methylpiperazin-1-yl)methyl)phenyl)-3-(4-phenylpyrimidin-2-ylamino)benzamide

DIEA (50 μL, 0.204 mmol) was added into a solution of 3-bromo-4-methylbenzoic acid (14 μmg, 0.049 mmol), 4-((4-methylpiperazin-1-yl)methyl)benzenamine (9 mg, 0.04 mmol), BOP (25 mg, 0.057 mmol) in DMF. The reaction mixture was stirred at rt under argon atmosphere overnight. The reaction mixture was then purified by a semi-preparative HPLC to give pure product as white powder. MS (ESI⁺) m/z 493.2 [M+1-1]⁺.

Example 5 N-(3-(4-Phenylpyrimidin-2-ylamino)phenyl)-4-(piperidin-1-ylmethyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-phenylpyrimidin-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 464.2 [M+H]⁺.

Example 6 4-(Piperidin-1-ylmethyl)-N-(3-(4-p-tolylpyrimidine-2-ylamino)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-p-tolylpyrimidine-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 478.3 [M+H]⁺.

Example 7 N-(3-(4-(4-Methoxyphenyl)pyrimidin-2-ylamino)phenyl)-4-(piperidin-1-ylmethyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-(4-methoxyphenyl)pyrimidin-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 494.2 [M+H]⁺.

Example 8 N-(3-(4-Phenyl-6-(trifluoromethyl)pyrimidin-2-ylamino)phenyl)-4-(piperidin-1-ylmethyl)benzamide

The synthesis method is analogous to EXAMPLE 1 wherein 4-phenyl-6-(trifluoromethyl)pyrimidin-2-amine was added in step (b) instead of 4-(3-chloro-2-fluorophenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 494.2 [M+H]⁺.

Example 9 4-Methyl-3-(4-phenylpyrimidin-2-ylamino)-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 4 wherein 4-(2-(pyrrolidin-1-yl)ethyl)benzenamine was added in step (c) instead of 4-((4-methylpiperazin-1-yl)methyl)benzenamine. MS (ESI⁺) m/z 478.1 [M+H]⁺.

Example 10 4-Methyl-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)-3-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)benzamide

(a) 3-Bromo-4-methyl-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)benzamide

DIEA (4734, 2.72 mmol) was added into a solution of 3-bromo-4-methylbenzoic acid (189 mL, 0.881 mmol), 4-(2-(pyrrolidin-1-yl)ethyl)benzenamine (140 mg, 0.734 mmol), BOP (487 mg, 1.01 mmol) in DMF. The reaction mixture was stirred at rt under argon atmosphere overnight. The reaction mixture was diluted with AcOEt, and then washed with IN NaOH aqueous solution three times. Organic phase was dried with anhydrous Na₂SO₄, and then evaporated to remove organic solvents. The obtained residue was further dried under high vacuum overnight to give crude product, which was used directly for the next step synthesis without further purification. MS (ESI) m/z 387.0 [M+H]⁺.

(b) 4-Methyl-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)-3-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)benzamide

A mixture of 3-bromo-4-methyl-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)benzamide (59 mg, 0.13 mmol) and 4-(3-(trifluoromethyl)phenyl)pyrimidin-2-amine (31 mg, 0.13 mmol), KOBu^(t) (22 mg, 0.2 mmol), Pd₂(dba)₃ (4.6 mg, 0.005 mmol) and Xantphos (4.6 mg, 0.008 mmol) in a microwave reaction vessel was suspended in 1 mL of THF. The reaction mixture was heated in a microwave at 150° C. for 90 min. After cooling, the mixture was diluted with DMF, and then filtered with a 0.45 μm microfilter. The obtained filtrate was separated by a semi-preparative HPLC. Collected product fraction was lyophilized to give pure product as a while powder. MS (ESI⁺) m/z 546.1 [M+H]⁺.

Example 11 4-Fluoro-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)-3-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)benzamide

The synthesis method is analogous to EXAMPLE 10 wherein 3-bromo-4-fluorobenzoic acid was added in step (a) instead of 3-bromo-4-methylbenzoic acid. MS (ESI⁺) m/z 550.0 [M+H]⁺.

Example 12 4-Methyl-3-(4-phenylpyridin-2-ylamino)-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 10 wherein 4-phenylpyridin-2-amine was added in step (b) instead of 4-(3-(trifluoromethyl)phenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 477.1 [M+H]⁺.

Example 13 4-Methoxy-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)-3-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)benzamide

The synthesis method is analogous to EXAMPLE 10 wherein 3-bromo-4-methoxybenzoic acid was added in step (a) instead of 3-bromo-4-methylbenzoic acid. MS (ESI⁺) m/z 562.1 [M+H]⁺.

Example 14 N-(4-(2-(Pyrrolidin-1-yl)ethyl)phenyl)-5-(4-(3-(trifluoromethyl)phenyl)pyrimidin-2-ylamino)-2,3-dihydrobenzofuran-7-carboxamide

The synthesis method is analogous to EXAMPLE 10 wherein 5-bromo-2,3-dihydrobenzofuran-7-carboxylic acid was added in step (a) instead of 3-bromo-4-methylbenzoic acid. MS (ESI^(÷)) m/z 574.1 [M+H]⁺.

Example 15 3-(4-Ethylpyridin-2-ylamino)-4-methyl-N-(4-(2-(pyrrolidin-1-yl)ethyl)phenyl)benzamide

The synthesis method is analogous to EXAMPLE 10 wherein 4-ethylpyridin-2-amine was added in step (b) instead of 4-(3-(trifluoromethyl)phenyl)pyrimidin-2-amine. MS (ESI⁺) m/z 429.0 [M+H]⁺.

Example 16 N2a Cell Assay Evaluation of Amyloid Beta (Ar) Production in N2a Cells.

The influence of compounds on Aβ production in N2a cells is carried out as described by Netzer, W. J., Dou, F., Cai, D., Veach, D., Jean, S., Li, Y., Bornmann, W. G., Clarkson, B., Xu, H., and Greengard, P. (2003) Proc Natl Acad Sci USA 100, 12444-12449. The exemplified Compounds of the Invention inhibit amyloid beta by at least 50% at concentrations 10 micromolar over 24 hours.

Example 17 Mouse Brain/Plasma Distribution Assay for the Evaluation of Tissue Levels of Test Compounds

Compounds are administered subcutaneously to C57bl/6 black mice as a single injection of 1 mg using a 10 mM DMSO solution. After 2 or 4 hours, the mice are sacrificed. Trunk blood is collected into tubes with potassium-EDTA as anticoagulant and centrifuged at 5000×g for 10 min. The upper plasma phase is decanted from cellular components. Whole brain is sonicated with 20 mM Tris-HCl, 135 mM NaCl, pH 7.4 buffer, giving at 200 mg/mL (w/v) homogenate. Brain homogenate or plasma is extracted with 2 volumes of acetonitrile and clarified by centrifugation at 15,000×g for 20 min. Extracts are separated by HPLC using a Waters Alliance 2695 separations module with a Sunfire™ C18 column (3.5 micron, 2.1×50 mm) and a gradient of methanol over 15 min in a mobile phase of 0.1% formic acid. The separation is monitored by a Micromass Quattro Micro triple-quadrupole mass-spectrometric detector. Compound standardization is performed by methods analogous to those previously reported, e.g., by Zhao, M., et al. (2005) J Chromatogr B Analyt Technol Biomed Life Sci 819, 73-80; and Appels, N. M et al. (2005) Rapid Commun Mass Spectrom 19, 2187-2192.

Brain concentration=measured−2% of plasma

B/P ratio=brain concentration/plasma concentration

Exemplified Compounds of the Invention have a B/P ratio in this assay at four hours post-administration of greater than 0.6, while having a brain concentration of greater than 0.3 μM at four hours post administration compared to the brain concentration of imatinib at four hours post-administration of less than 0.1 μM, demonstrating a substantially higher level of penetration and accumulation in the brain for the Compounds of the Invention. 

What is claimed:
 1. A compound of formula (I):

in free or salt form, wherein: A¹ is CH or N; R¹ is C₁₋₆alkyl, C₁₋₆cycloalkyl, or aryl optionally substituted with alkyl, haloalkyl, alkyloxy, or halo group; R², R³, R⁴, R⁵, R⁶ and R⁷ are independently hydrogen, halo, C₁₋₄alkyl, C₁₋₄alkyloxy, or trifluoromethyl; or R⁵ and R⁶, together with carbon atoms to which they are attached, form a 5 or 6 member hetcyclic ring; Y is —NHCO—, —CONH—, —NHSO₂—, —NHCONH—, or —NHCH₂—; D is a 5 or 6 member aryl, hetaryl, or hetcyclic ring having at least one N, S, or O ring atom, or a C ring atom forming an oxo (C═O) moiety; provided that D is not a substituted phenyl group if A¹=N and R²═R³═R⁴═R⁵═R⁶═H and R⁷═CH₃ and Y═NHCO; and R⁸ is C₀₋₆alkyl, C₃₋₇cycloalkyl, aryl, hetaryl, hetcyclyl(C₀₋₄alkyl)-, or —C₀₋₆alkyl-N(C₀₋₆ alkyl)(C₀₋₆alkyl), optionally substituted with C₁₋₆alkyl.
 2. The compound according to claim 1 selected from

in free or salt form.
 3. The compound according to claim 1 or 2, wherein said compound is:

in free or salt form.
 4. The compound according to claim 1 or 2, wherein said compound is:

in free or salt form.
 5. A pharmaceutical composition which comprises a compound, in free or pharmaceutically acceptable salt form, as claimed in any of the preceding claims, in association with a pharmaceutically-acceptable diluent or carrier.
 6. A compound, in free or pharmaceutically acceptable salt form, as claimed in any one of the preceding claims for use as a medicament.
 7. Use of a compound, in free or salt form, as claimed in any of claims 1-4, in the manufacture of a medicament for use in the treatment of Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloidosis, Parkinson's disease, Huntington's disease, or prion disease.
 8. Use of a compound, in free or salt form, as claimed in any of claims 1-4 in the manufacture of a medicament for use in the treatment of Alzheimer's disease.
 9. Use of a compound, in free or salt form, as claimed in any one of claims 1-4, in the manufacture of a medicament for use in the treatment of astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, or pituitary adenoma.
 10. A pharmaceutical composition comprising an effective amount of a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4, for use in the treatment, control and management of diseases characterized by accumulation of abnormal protein aggregates.
 11. A pharmaceutical composition comprising an effective amount of a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4, for use in the treatment, control and management of diseases characterized by accumulation of abnormal protein aggregates in the brain.
 12. A pharmaceutical composition comprising an effective amount of a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 for use in the treatment, control and management of Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloidosis, Parkinson's disease, Huntington's disease, prion disease.
 13. The pharmaceutical composition according to claim 12 for use in the treatment, control and management of Alzheimer's disease.
 14. A pharmaceutical composition comprising an effective amount of a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 for use in the treatment, control and management of vascular, neurological, or neurodegenerative disorders related to the abnormal expression or accumulation of tau or amyloid proteins.
 15. A pharmaceutical composition comprising an effective amount of a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 for use in the treatment, control and management of abnormal protein aggregates of amyloid plaques, neurofibrillary tangles, or precipitates of tau or amyloid proteins.
 16. A pharmaceutical composition which comprises a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of hyperproliferative diseases.
 17. A pharmaceutical composition which comprises a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of cancers of the brain or central nervous system.
 18. A pharmaceutical composition which comprises a compound, in free or pharmaceutically acceptable salt form, as claimed in any one of claims 1-4 in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, or pituitary adenoma.
 19. A method for the treatment control and management of one or more diseases characterized by accumulation of abnormal protein aggregates comprising administering to a patient in need thereof, a compound according to any of claims 1-4, in free or pharmaceutically acceptable salt form.
 20. The method according to claim 19, wherein said disease is selected from a group consisting of Alzheimer's disease, progressive supranuclear palsy, Down Syndrome, memory and cognitive disorders, dementia, amyloid neuropathies, brain inflammation, nerve and brain trauma, vascular amyloidosis, cerebral hemorrhage with amyloidosis, Parkinson's disease, Huntington's disease, and prion disease.
 21. The method according to claim 19 or 20, wherein said disease or disorder is Alzheimer's disease.
 22. A method for the treatment of one or more hyperprofilerative diseases comprising administering to a patient in need thereof, a compound according to any of claims 1-4, in free or pharmaceutically acceptable salt form.
 23. The method according to claim 22, wherein said disease is selected from a group consisting of astrocytoma, medulloblastoma, oligdendroglioma, glioblastoma, glioma, ependymoma, meningioma, sarcoma, germ cell tumor, pinealoma, craniopharyngioma, and pituitary adenoma. 